Locomotive with three cylinders



April 14, 1925. 1,533,146

J. STUMPF LOCOMOTIVE WITH THREE CYLINDERS Filed April 17, 1916 ['wenwr} JEmam/JW 7?? fliiforney.

- Patented Apr. 14, 1925.

UNITED STAT PATENT OFFICE.

5011mm smaller, or BERLIN,- Gunman.

Locomo'nvn WITH THREE crrimnnns.

Application filed April 17, 1816. Serial No. 91,792.

To all whom it may concern:

Be it known that I, JoHANN STUMPF, a citizen of the German Republic, residing at Berlin, Germany, have -.invented a new and useful Locomotive with Three Cylinders, of which the following is a specification.

The invention relates to locomotives with three steam cylinders and especially to the arrangement andto the distributing gear of said cylinders.

It is known, in combination with threecylinder-locomotives, to have the distributing valve of the middle cylinder moved by lever and'shaft mechanism from the valves of the side cylinders, for which mechanism there are many modes of execution. j

The present invention comprises the arrangement of the two side cylinders of the locomotive, at a common level above the rails, with-a middle cylinder-mounted at a higher level and with it's'axis directed downwardly toward its crank shaft, so that underneath said middle cylinder may be arranged the connecting mechanism of the truck or empty running axles, and so that the piston rod and connecting rod ,of the middle cylinder may pass freely above the several intel-posed shafts of the wheels.

The invention also comprises the dislocation of the middle crank pinwith reference to its normal position, by an angle approximately equal to the angle between the axis of the middle cylinder and the plane of the axes of'the side cylinders; so that the dis-' tributing and lever mechanism between the side cylinders and the middle cylinder may be used without any alteration.

The object therefore of this invention is to secure a proper positioning of the middle cylinder so as not to-interfere with support: ing mechanism, and also to provide a simple crank and valve gear arrangement, that will secure the required relative. movement of the middle cylinder valve.

Figs. 1 and 2, the locomotive comprises a truck with two pairs of wheels 1, 2 and one or more pairs of driving wheels 3. The driving force is, given by three steam cylinderst, 5. 6, of which the cylinders 4, 6 are mounted in the usual manner at the sides of the frame 7, and the third cylinder 5 is arranged between the side cylinders and at a higher level. The axis of each side cylinder is directed'horizontally to thecrank shaft 8, and the axis of the middle cylinder is inclined downwardly toward the crank shaft 8. l

The sidecylinders 4 and 6 in Figs. 1 and 2 are fitted'with the slide, valve casings'i) and 10, upon the upper side, and the middle I cylinder 5 is fitted with a slide valve-easing;

11 at its under side. All the slide-valve cas-v ings are mounted horizontally. The slide-l valve rods 12 and 13 of the side cylinders,

are. connected, as at 12 and 13", to any suitable valve operating gear, not shown. These valve rods-12 and 13 are also connected by $0 j link rods '14 and 15, to double armed levers 16, 17, which are pivoted on the frame 7. 3

The other ends of the said levers 16, 17 are connected by links 18, 19 to a double armerl lever 20, mounted on the slide-valverod 21-.

of the middle cylinden' By the mechanism described, the middle valve rod is moved in such a. manner, that its position, in every moment, is. the same as though the three crank pins 22,23, 24, were located for 120;between each other with the, axes of the cylinders in the same plane. The

middle crank pin 23 now being dislocated with reference to the 120 position, for approximately the same angle as that between the .axis of the middle cylinder and the horizontal axis of the side cylinder. -The positions of the middle piston, relative to its' cylinder 5, in every moment, are the same as if the middle cylinder 5 were located in the same plane as, the side cylinders 4, 6, with all cranks placed at 120.

Each'of the double armed levers 16 and 17, has one arm ap roximately twice as long as the other, an the rods or links 14 and 15, are ivoted to the shorter arms, so

as to trans er the movementsof substantially the same kind and amount, of the said slide-valve rods 12 and 13 in approximately doubled'scale to the combininglever 20 of the middle valve. By this means the movement of the middle valve'is-oorrect, and of proper amount, and no doubled diameter of the slide-valve or double size of the steam ports is needed. Referrin to the modification shown in Figs. 3 an 4, the wheels'1,.2 and 3, and thearrangement of cylinders 4, 5 and 6 are the same as in Figs. 1- and 2; also the slidevalve casings 9 and 10 of the side have the same arrangement. I The slide-valve casing 11, of the middle cylinder 5, is mounted on the upper side of said cylinder, in the same manner as shown with respectto the side cylinders 4 and 6, and the axis of said middle slide valve therefore is inclined downwardly at the same angle as the axis of the middle cylin- I The lever and shaft mechanism, connectin the valve rods 12, 21 and 13, of the three 'cy inders, comprises a pair of rocking shafts and 26, mounted in hearings on the frame 7 To the rocking shafts 25 and;26 are connected a shorter lever 27, 28" on the outer end, and a longer lever 29, onthe inner end of each shaft respectively. The levers 27 28, 29 and 30 are connected in a similar way, as in Figs. 1 and 2, by link rods 14,

15 to slide valve rods 12 and 13, and by link-V rods 18 and 19 to the double ar'medlever 20 ivoted at the middle to slide-valve rod 21.

he outer levers 27 and 28 are ap roximately half the length of. the inner evers 29, 30 and the movement therefore is transcylinders ferred in the right scale to the valve, as above explained.

B the term locomotive, as used in this app ication, I mean to use it in the broader sense, that is, to include all auto-motive engines whether running on rails or. not.

What I claim 1s: 3

In a locomotive, the combination of three tion to said common plane and having its crank dislocated from its normal 120 position at approximatelythe same angle, said.

cylinders provided with suitable distribu tion valves, and each side-cylinder-valve with a suitable valve gear, and means for to the middle cylinder valve movements of substantially communicating a resultant o the same kind and amount, derived from the side cylinder valve gear actuations, in order middle slide I to secure proper relative distribution to said.

three cylinders. m

In testimony whereof I aflix my signature in presence oftwo witnesses.

' J OHANN STUMPF.

Witnesses: I v

. Monro WERNER, SELNNA WILKE. 

